A phased array high-intensity radiation field system architecture and its optimized test method

Abstract

The present invention discloses a phased array high-intensity radiation field system architecture and an optimization test method thereof, comprising an excitation source and a front-stage power division excitation architecture connected to the excitation source; the front-stage power division excitation architecture comprises a front-stage excitation channel and an amplitude-stabilizing and phase-stabilizing power division network, a plurality of front-stage excitation channels are respectively connected to the amplitude-stabilizing and phase-stabilizing power division network, the amplitude-stabilizing and phase-stabilizing power division network comprises a plurality of power dividers and amplitude-stabilizing and phase-stabilizing cables, and each front-stage excitation channel is connected to a power divider; each power divider is connected to a plurality of final-stage power modules through the amplitude-stabilizing and phase-stabilizing cables, and each final-stage power module is connected to a corresponding antenna array element; a plurality of antenna array elements are symmetrically distributed in a square array, and the present invention reduces the system's demand for total output power by effectively avoiding a shaping recessed area strategy; through the symmetry design of a shaping algorithm, the system's front-stage channel is symmetrically simplified and designed, and the volume of the front-stage excitation channel is reduced, thereby achieving the purpose of significantly reducing the system cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic compatibility and electromagnetic environment effects, and specifically relates to a phased array high-intensity radiation field system architecture and an optimized testing method thereof. Background Art

[0002] The phased array high-intensity radiated field system (HIRF) is a device used for electromagnetic compatibility and electromagnetic effect testing. It can simulate the high-intensity electromagnetic field environment of the test equipment during actual operation, and is used to test the electromagnetic compatibility and electromagnetic effect safety characteristics of the test equipment during actual operation, thereby achieving the purpose of verifying that the equipment can operate safely and reliably during its life cycle.

[0003] With the vigorous development of low-altitude economy, civil aviation, smart cars and other fields, electromagnetic compatibility and effect testing have been widely valued in various industries. In recent years, electromagnetic compatibility and effect test standards and test methods suitable for various fields have been introduced; as a result, high-intensity radiation field system as electromagnetic compatibility test equipment has seen a surge in demand in various industry testing fields.

[0004] The phased array high-intensity radiation field system is a system equipment based on the phased array system, which uses near-field focusing and shaping technology to effectively synthesize high field strength. Compared with traditional radiation field systems, it has the advantages of high synthetic field strength, adjustable focal spot, and more flexible testing. It is a landmark technology of the new generation of high-intensity radiation field systems.

[0005] As a test equipment, the phased array high-intensity radiation field system is usually a wide-band microwave system. The digital phase shifters and final-stage power modules it contains are quite expensive. Therefore, the front-stage excitation module (including the digital phase shifter) and the final-stage power module account for a considerable proportion of the total system hardware cost. How to reduce the total system power volume and the number of front-stage excitation modules through system architecture improvement is a technical problem that needs to be urgently solved in the phased array high-intensity radiation field system. To this end, we propose a phased array high-intensity radiation field system architecture and its optimization test method. Summary of the invention

[0006] The object of the present invention is to provide a phased array high-intensity radiation field system architecture and an optimized test method thereof to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a phased array high-intensity radiation field system architecture, comprising an excitation source and a front-stage power division excitation architecture connected to the excitation source;

[0008] The front-stage power division excitation architecture includes a front-stage excitation channel and a stable amplitude and phase power division network, wherein:

[0009] There are a plurality of front-stage excitation channels, and the plurality of front-stage excitation channels are respectively connected to the amplitude-stabilizing and phase-stabilizing power division network, and the amplitude-stabilizing and phase-stabilizing power division network includes a plurality of power dividers and amplitude-stabilizing and phase-stabilizing cables, and each front-stage excitation channel is connected to a power divider;

[0010] Each of the power dividers is connected to a plurality of final-stage power modules via the amplitude-stabilizing and phase-stabilizing cables, and each of the final-stage power modules is connected to a corresponding antenna array element;

[0011] The plurality of antenna array elements are symmetrically distributed in a square array.

[0012] Preferably, the front-stage excitation channel has a built-in digital phase shift module, and the digital phase shift module is connected to the amplitude-stabilizing and phase-stabilizing power division network.

[0013] Preferably, the power divider, the amplitude- and phase-stabilizing cable, the final-stage power module and the antenna array element are in phase with each other.

[0014] An optimization test method for a phased array high-intensity radiation field system architecture comprises the following steps:

[0015] S1: Determine the construction parameters of the phased array high-intensity radiation field system, the construction parameters include the operating frequency band [f a ,f b ], field strength index E0 and focal spot diameter index D0;

[0016] S2: According to the construction parameters of the phased array high-intensity radiation field system, the minimum power P0 corresponding to any frequency point in the working frequency band is calculated, and the minimum power P0 meets the field intensity index E0 and the focal spot diameter index D0 in the near-field focusing state;

[0017] S3: The phased array high-intensity radiation field system tests different frequency points at the same distance. The minimum power margin required to meet the working frequency band test requirements of the phased array high-intensity radiation field system is determined based on the minimum power P0. The loss of high-frequency band frequency shaping is covered by the minimum power margin. The required minimum power margin is calculated according to the minimum power margin calculation formula. , the minimum power margin calculation formula is as follows:

[0018] ;

[0019] Among them, f a Indicates the lower frequency boundary of the system to achieve the specified field intensity focal spot index;

[0020] f b Indicates the upper frequency boundary of the system to achieve the specified field intensity focal spot index;

[0021] f means Any frequency point between

[0022] Indicates the shaping boundary frequency point;

[0023] loss represents the energy loss function within the focal spot;

[0024] S4: Based on the minimum power combined with the minimum power margin P0+ , and the set array size, determine the test distance R, and satisfy the boundary frequency point at the distance R Producing shaped boundary field intensity through near-field beam focusing and the focal spot diameter index D0;

[0025] S5: Yes The frequency points between 200 and 250 are used to achieve the required field strength and focal spot through near-field focusing technology; Near-field beamforming is used to achieve the required field strength and focal spot.

[0026] Preferably, for Between and close to The frequency point is widened according to the shaping requirements, so that the field strength and focal spot are more uniform at each frequency point. The widening multiple of the frequency point f The following relationship is satisfied:

[0027] ;

[0028] Among them, D0 represents the focal spot diameter index, and D represents the frequency point The corresponding focal spot diameter formed after near-field focusing.

[0029] Preferably, the specific process of widening according to the shaping requirements is as follows:

[0030] After selecting the test distance R, the boundary frequency points are shaped For the previous frequency points, the frequency points whose field strength values ​​exceed the set threshold range are optimized and shaped, expanding the focal spot diameter index while making the field strength of the entire frequency band meet the set threshold range;

[0031] Shaped boundary frequency After that, all the frequency points are optimized and shaped so that the field intensity of the frequency band meets the threshold range and the focal spot diameter meets D0, and the working frequency band [f a ,f b ] is not less than the field strength index E0 and is within the set threshold range, and the focal spot diameter satisfies D0.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention reduces the system's demand for total output power by effectively avoiding the shaping depression area strategy; through the symmetry design of the shaping algorithm, the system's front-stage channels are symmetrically simplified to reduce the volume of the front-stage excitation channels. On the basis of meeting system indicators, the hardware volume can be optimized from two aspects: total power volume and the number of front-stage excitation channels, thereby achieving the purpose of significantly reducing system costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the architecture of the phased array high-intensity radiation field system of the present invention;

[0035] Figure 2 It is a schematic diagram of symmetry division of the phased array antenna array of the present invention;

[0036] Figure 3 Schematic diagram of energy loss curve in near-field beamforming focal spot;

[0037] Figure 4 It is a schematic diagram of the optimization of the phased array high-intensity radiation field system architecture of an embodiment;

[0038] Figure 5 Schematic diagram of the existing standard architecture of phased array high-intensity radiation field.

[0039] In the figure: 1. excitation source; 2. front-stage excitation channel; 3. amplitude-stabilizing and phase-stabilizing power division network; 4. final-stage power module; 5. antenna array element; 6. power divider; 7. amplitude-stabilizing and phase-stabilizing cable; 8. digital phase shift module. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 2 , the phased array high-intensity radiation field system architecture provided by the present invention includes an excitation source 1 and a front-stage power division excitation architecture connected to the excitation source 1;

[0042] The front-stage power division excitation architecture includes a front-stage excitation channel 2 and a stable amplitude and phase power division network 3, wherein:

[0043] There are four front-stage excitation channels 2, which are respectively connected to the amplitude-stabilized phase-stabilized power division network 3. The amplitude-stabilized phase-stabilized power division network 3 includes four power dividers 6 and amplitude-stabilized phase-stabilized cables 7. Each front-stage excitation channel 2 is connected to a power divider 6. The front-stage excitation channel 2 has a built-in digital phase shifting module 8, which is connected to the amplitude-stabilized phase-stabilized power division network 3.

[0044] Each power divider 6 is connected to four final-stage power modules 4 via an amplitude-stabilizing and phase-stabilizing cable 7 , and each final-stage power module 4 is connected to a corresponding antenna array element 5 , and a plurality of antenna array elements 5 are symmetrically distributed in a square array.

[0045] Preferably, the phases of the power divider 6, the amplitude-stabilizing and phase-stabilizing cable 7, the final-stage power module 4 and the antenna array element 5 are consistent. While constraining the phase consistency requirements for all power dividers, amplitude-stabilizing and phase-stabilizing cables, final-stage power modules and antenna array elements of the entire machine, the amplitude-stabilizing and phase-stabilizing cables, the final-stage power modules and the antenna array elements are tested, screened and classified, and the phase difference intervals of all amplitude-stabilizing and phase-stabilizing cables, the final-stage power modules and the antenna array elements are divided into 4 parts, each of which contains 4 components or units with higher phase consistency, further reducing the phase difference between similar front-stage excitation channels 2 after the power divider, and improving the phase consistency within the front-stage excitation channel 2. Then, the system is designed with a symmetric unit and a genetic algorithm phase is optimized to obtain a reasonable shaping result.

[0046] The optimization test method of the phased array high-intensity radiation field system architecture provided by the present invention comprises the following steps:

[0047] S1: Determine the construction parameters of the phased array high-intensity radiation field system, the construction parameters include the operating frequency band [f a ,f b ], field strength index E0 and focal spot diameter index D0;

[0048] S2: According to the construction parameters of the phased array high-intensity radiation field system, the minimum power P0 corresponding to any frequency point in the working frequency band is calculated, and the minimum power P0 meets the field intensity index E0 and the focal spot diameter index D0 in the near-field focusing state;

[0049] S3: The phased array high-intensity radiation field system tests different frequency points at the same distance. The minimum power margin required to meet the working frequency band test requirements of the phased array high-intensity radiation field system is determined based on the minimum power P0. The loss of high-frequency band frequency shaping is covered by the minimum power margin. The required minimum power margin is calculated according to the minimum power margin calculation formula. , the minimum power margin calculation formula is as follows:

[0050] ;

[0051] Among them, f aIndicates the lower frequency boundary of the system to achieve the specified field intensity focal spot index;

[0052] f b Indicates the upper frequency boundary of the system to achieve the specified field intensity focal spot index;

[0053] f means Any frequency point between

[0054] Indicates the shaping boundary frequency point;

[0055] loss represents the energy loss function within the focal spot;

[0056] S4: Based on the minimum power combined with the minimum power margin P0+ , and the set array size, determine the test distance R, and satisfy the boundary frequency point at the distance R Shaped boundary field intensity can be generated by near-field beam focusing and the focal spot diameter index D0;

[0057] S5: Yes The frequency points between 200 and 250 are used to achieve the required field strength and focal spot through near-field focusing technology; Near-field beamforming is used to achieve the required field strength and focal spot.

[0058] In this embodiment, for Between and close to The frequency point is widened according to the shaping requirements, so that the field strength and focal spot are more uniform at each frequency point. The widening multiple of the frequency point f The following relationship is satisfied:

[0059] ;

[0060] Among them, D0 represents the focal spot diameter index, and D represents the frequency point The corresponding focal spot diameter formed after near-field focusing.

[0061] In this embodiment, the specific process of widening according to the shaping requirements is as follows:

[0062] After selecting the test distance R, the boundary frequency points are shaped For the previous frequency points, the frequency points whose field strength values ​​exceed the set threshold range are optimized and shaped, expanding the focal spot diameter index while making the field strength of the entire frequency band meet the set threshold range;

[0063] Shaped boundary frequency After that, all the frequency points are optimized and shaped so that the field intensity of the frequency band meets the threshold range and the focal spot diameter meets D0, and the working frequency band [f a ,f b] is not less than the field strength index E0 and is within the set threshold range, and the focal spot diameter satisfies D0.

[0064] Selecting the appropriate minimum power margin Finally, it is also important to choose a suitable measurement distance, which is S4. If the distance is greater than R, then f a The frequency field strength cannot reach E0; if the distance is selected to be less than R, the loss caused by the second half of the shaping may be greater than ,Right now It will also fail to cover the loss caused by subsequent shaping;

[0065] In summary, the minimum power margin determined in S3 Together with the measurement distance R selected in S4, it is ensured that the volume required by the system is the minimum power volume.

[0066] For phased array antennas, the far field under equal amplitude and co-phase illumination can be regarded as a plane wave, while the HIRF system works in the near field. For the near field beam, after phase adjustment to make up for the distance phase difference between the target focus and each array element, near field focusing can be achieved, and it can be compared with the far field beam under equal amplitude and co-directional illumination: the focal spot diameter at low frequency is large and the field strength is small; the focal spot diameter at high frequency is small and the field strength is strong, and the field strength is proportional to the frequency, and the focal spot diameter is inversely proportional to the frequency. The phased array high-intensity radiation field system uses near-field technology to achieve power synthesis and obtain the field strength and focal spot that meet the requirements. The focal spot here is usually a 3dB circular energy area characterized by diameter, and the field strength at the edge of the focal spot is 0.707 times the field strength at the center.

[0067] For the near-field phased array, the beam at the same frequency is shaped and broadened by different multiples, and the results of the energy loss in the focal spot are as follows: Figure 3 As shown, it can be seen that the energy in the 3dB focal spot varies greatly under different shaping and widening factors: when the beam is widened by shaping, the energy in the 3dB focal spot decreases rapidly, and reaches the minimum when the widening is about 1.9 times; after continuing to widen, the energy in the focal spot rises back, and after the widening factor reaches close to 3, the energy in the focal spot even gains some benefits. For arrays with different array sizes, the optimization shaping experiments are carried out, and the trends of the above curves are basically the same, so this conclusion is universal.

[0068] Based on this result, when designing a phased array high-intensity radiation field system, we can carefully design the appropriate power volume and shaping strategy to avoid the deep energy utilization interval as much as possible, thereby achieving the effect of saving power volume.

[0069] Assume that the frequency band to be designed [f a ,f bThe phased array high-intensity radiation field system on the ] requires that the center field strength of the focal spot in the whole frequency band should be ≥ E0, and the 3dB focal spot diameter index should be ≥ D0. The required index can be expressed as E0×D0. The power margin for the design is (dB): It can be explained as: for a specific frequency point, at an appropriate test distance, the system can achieve a shaped boundary field strength through near-field beam focusing. and the focal spot diameter index D0;

[0070] Assumptions Figure 3 The function is loss(x), x is the beam width multiple, which can be determined by the following formula Specific values:

[0071]

[0072] In the above formula: (1) Minimum power margin Selection and working frequency band [f a ,f b ] is related to the width of the frequency band. The wider the frequency band, the larger the power margin needs to be designed.

[0073] (2) Selected Then, according to the shaping boundary frequency The shaping design is performed by near-field focusing to exactly meet the test distance corresponding to the focal spot D0.

[0074] The above design steps realize the a ,f b ] In the full frequency band, at the uniform test distance R, it produces the field strength index (≥E0) and focal spot diameter index (≥D0) that meet the requirements.

[0075] The core of the above optimization test method is to select a suitable measurement distance, make full use of the system margin, focus on the near field of the first half, make the shaping start from the middle, minimize the widening multiple, and further, Figure 3 It can be seen that another way to save power volume is to start shaping directly from high-multiple widening, also avoiding the deep depression in the middle; but this design method requires reducing the measurement distance exponentially, and too small a test distance often leads to the deterioration of the standing wave of the entire machine and even affects the safety of the equipment. Therefore, unless the original design test distance is large, it is recommended to adopt the aforementioned strategy and will not be described in detail.

[0076] The above actually provides a test method for optimizing the phased array high-intensity radiation field system, which can reduce the requirements for the total final-stage output power volume. After the final-stage power volume is determined, the present invention provides an architecture method that can further reduce the cost of the RF front stage:

[0077] The above optimization test process provides the optimal power design for the phased array high-intensity radiation field system to meet the field strength E0 and focal spot D0 in the entire frequency band, as well as the process method for achieving field strength E0 and focal spot D0 at different frequency points. After determining the system power volume, the front-stage channel of the phased array high-intensity radiation field system can be simplified to further reduce the system cost and complexity;

[0078] For phased array high-intensity radiation field systems, the first thing to achieve is near-field focusing, such as Figure 2 As shown, the focus is usually selected on the axis of the array (i.e., the Z-axis direction), and the distance from the array is usually required to be ≥1m, and the focal diameter ratio must be greater than 1.

[0079] Assuming that the design is a square array with 2N×2N units, it is only necessary to compensate for the path difference of the focus of each antenna element and make the electric field radiated by all antenna elements arrive in phase to achieve near-field focusing. The field strength at the focus is:

[0080] ;

[0081] Where C is the excitation amplitude factor, is a complex function in the electromagnetic field with the natural number e as the base, For unit S mn The preset phase, S mn represents the antenna element at the mth row and nth column, kR mn is the spatial phase delay, k is the wave number coefficient, R mn The size of has central symmetry with respect to the array surface. For all antenna array elements whose coordinate points are on the same circle about the origin O, the wave path to the focus is the same. Therefore, the same preset phase can be fed to achieve in-phase superposition of the electric field. For units fed with the same phase, the same pre-stage excitation channel can be used.

[0082] From the above, we know that the entire antenna array can be divided into at least four quadrants according to the XY axis, and the four antenna units symmetrical about the X axis or Y axis are fed with the same phase; at this time, the above focal field strength formula is converted to

[0083] ;

[0084] While saving the hardware of the front-stage excitation channel, the genetic algorithm is used to optimize the phase weighting and optimize the parameters. Quantity from 4N 2 Reduce to N 2 , greatly improving the convergence speed of the algorithm. When the observation point is selected as any point in the focal spot, due to the central symmetry of the circular focal spot, the above group feeding method does not lose its generality;

[0085] Figure 4 The invention is a phased array high-intensity radiation field system architecture based on symmetry optimization design, wherein the amplitude-stabilized phase-stabilized power division network is composed of a power divider and an amplitude-stabilized phase-stabilized cable. The invention requires that all devices (including power dividers, amplitude-stabilized phase-stabilized cables, final power modules and antenna array elements) after each front-stage excitation channel of the phased array high-intensity radiation field system architecture have phase consistency. In actual implementation, in addition to ensuring the index requirements of phase consistency of all devices in the design stage, each device module can be tested and screened separately to ensure that the four links after each front-stage excitation channel have higher phase consistency, and the phase between each front-stage excitation channel can be adjusted through a digital phase shift module;

[0086] Furthermore, the array surface can be divided into eight symmetrical parts according to the XY axis, Y=X and Y=-X, which further reduces the number of required front-stage excitation channels and shaping optimization parameters, and no further elaboration is required;

[0087] In particular, when the phased array high-intensity radiation field system architecture needs to achieve one-dimensional scanning of the focal spot (usually in the elevation direction), the path difference between the antenna array elements at the focal point only has the symmetry along the XOZ plane. At this time, the focal field strength is expressed as:

[0088] ;

[0089] In this case, half of the volume of the pre-stage excitation channel can still be saved, and the shaping optimization parameters The number is .

[0090] Furthermore, for various situations such as the array with (2N+1)×(2N+1) antenna units, the array symmetrical angle-cut array, and the antenna array arranged in dual polarization, the volume optimization design of the front-stage excitation channel of the phased array high-intensity radiation field system architecture is carried out by using the symmetry of the array and the focal spot. This has considerable universality and can be widely used in the development of various phased array high-intensity radiation field systems.

[0091] By effectively avoiding the shaping depression area strategy, the system's demand for total output power is reduced; through the symmetry design of the shaping algorithm, the system's front-stage channels are symmetrically simplified and designed to reduce the size of the front-stage excitation channels. The combination of the two can optimize the hardware size from two aspects: total power size and the number of front-stage excitation channels (including digital phase shift modules) on the basis of meeting system indicators, thereby achieving the goal of significantly reducing system costs.

[0092] Depend on Figure 5It can be seen that in the traditional phased array high-intensity radiation field system structure, the "pre-stage excitation module, final-stage power module, and antenna unit" are one-to-one corresponding. The present invention adds a "stable amplitude and phase power division network" between the pre-stage excitation module and the final-stage power module, and corresponds the channels after the power division to the final-stage power module according to certain rules, thereby reducing the number of pre-stage excitation modules, optimizing the hardware volume, and achieving the purpose of significantly reducing system costs.

[0093] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A phased array high-intensity radiation field system architecture, characterized in that: It includes an excitation source and a front-stage power division excitation structure connected to the excitation source; The front-stage power division excitation architecture includes a front-stage excitation channel and a stable amplitude and phase power division network, wherein: There are a plurality of front-stage excitation channels, and the plurality of front-stage excitation channels are respectively connected to the amplitude-stabilizing and phase-stabilizing power division network, and the amplitude-stabilizing and phase-stabilizing power division network includes a plurality of power dividers and amplitude-stabilizing and phase-stabilizing cables, and each front-stage excitation channel is connected to a power divider; Each of the power dividers is connected to a plurality of final-stage power modules via the amplitude-stabilizing and phase-stabilizing cables, and each of the final-stage power modules is connected to a corresponding antenna array element; The plurality of antenna array elements are symmetrically distributed in a square array.

2. A phased array high-intensity radiation field system architecture according to claim 1, characterized in that: The front-stage excitation channel has a built-in digital phase shift module, and the digital phase shift module is connected to the amplitude-stabilizing and phase-stabilizing power division network.

3. The phased array high-intensity radiation field system architecture according to claim 1, characterized in that: The power divider, the amplitude- and phase-stabilizing cable, the final-stage power module and the antenna array element are in phase with each other.

4. The optimization test method of a phased array high-intensity radiation field system architecture according to any one of claims 1 to 3, characterized in that: The steps include: S1: Determine the construction parameters of the phased array high-intensity radiation field system, the construction parameters include the operating frequency band [f a ,f b ], field strength index E0 and focal spot diameter index D0; S2: According to the construction parameters of the phased array high-intensity radiation field system, the minimum power P0 corresponding to any frequency point in the working frequency band is calculated, and the minimum power P0 meets the field intensity index E0 and the focal spot diameter index D0 in the near-field focusing state; S3: The phased array high-intensity radiation field system tests different frequency points at the same distance. The minimum power margin required to meet the working frequency band test requirements of the phased array high-intensity radiation field system is determined based on the minimum power P0. The loss of high-frequency band frequency shaping is covered by the minimum power margin. The required minimum power margin is calculated according to the minimum power margin calculation formula. , the minimum power margin calculation formula is as follows: ； Among them, f a Indicates the lower frequency boundary of the system to achieve the specified field intensity focal spot index; f b Indicates the upper frequency boundary of the system to achieve the specified field intensity focal spot index; f means Any frequency point between Indicates the shaping boundary frequency point; loss represents the energy loss function within the focal spot; S4: Based on the minimum power combined with the minimum power margin P0+ , and the set array size, determine the test distance R, and satisfy the boundary frequency point at the distance R Producing shaped boundary field intensity through near-field beam focusing and the focal spot diameter index D0; S5: Yes The frequency points between 200 and 250 are used to achieve the required field strength and focal spot through near-field focusing technology; Near-field beamforming is used to achieve the required field strength and focal spot.

5. The optimization test method of a phased array high-intensity radiation field system architecture according to claim 4, characterized in that: for Between and close to The frequency point is widened according to the shaping requirements, so that the field strength and focal spot are more uniform at each frequency point. The widening multiple of the frequency point f The following relationship is satisfied: ； Among them, D0 represents the focal spot diameter index, and D represents the frequency point The corresponding focal spot diameter formed after near-field focusing.

6. The optimization test method of a phased array high-intensity radiation field system architecture according to claim 5, characterized in that: The specific process of widening according to the shaping requirements is as follows: After selecting the test distance R, the boundary frequency points are shaped For the previous frequency points, the frequency points whose field strength values ​​exceed the set threshold range are optimized and shaped, expanding the focal spot diameter index while making the field strength of the entire frequency band meet the set threshold range; Shaped boundary frequency After that, all the frequency points are optimized and shaped so that the field intensity of the frequency band meets the threshold range and the focal spot diameter meets D0, and the working frequency band [f a ,f b ] is not less than the field strength index E0 and is within the set threshold range, and the focal spot diameter satisfies D0.

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